Young people clashed with riot police on Monday in Athens as about 4,000 marched to honor the killing of a teenager a few years ago by a policeman.
Video footage showed the demonstrators throwing stones, Molotov cocktails, and smoke bombs at policemen.
They also smashed windows of shops, banks, and phone booths on their way to the Parliament building.
Riot police were seen firing tear gas back using police sticks to control protesters.
Some of banners held by protesters read, "Greece is not a protectorate" and "IMF out," Agency France Press reported. The last sign referred to the International Monetary Fund’s bailout loan aimed to save Greece from bankruptcy this year.
The 2008 shooting of 15-year-old Alexis Grigoropoulos took place during a night police patrol and caused a series of anti-police protests across the country. A Greek court convicted policeman Epaminondas Korkoneas of killing the teenager in October and sentenced him to life in prison.
